Two charged spheres repel (attached to strings)

It's been awhile since I've had physics I, so this problem is giving me a headache.

Q) Two very small conducting spheres, each of a mass [itex] 1.0 \times 10^{-4}\,\,(kg) [/itex], are suspended at a common point by very thin nonconducting threads of a length [itex] 0.2 \,\,(m) [/itex]. A charge [itex] Q [/itex] is placed on each sphere. The electric force of repulsion separates the spheres, and an equilibrium is reached when the suspending threads make an angle of [itex] 10 \,\, (deg) [/itex]. Assuming a gravitational force of [itex] 9.80 \,\, (N/kg) [/itex] and a negligible mass for the threads, find [itex] Q [/itex].

Setting up the coordinate system we assume the orgin as at the point of interesection of the two threads. Thus, a vector that points to sphere-two is:
[tex] \vec S_2 = \hat x(0.2 \sin 5^{\circ}) - \hat y(0.2 \cos 5^{\circ}) [/tex]